Creed lead singer Scott Stapp, who posted a since-removed Facebook video in November saying he was destitute, homeless and sick, announced that he has since been treated for bipolar disorder.

"I had a psychotic break that was brought on by alcohol and drug abuse," Stapp, 41, tells People magazine in the issue being published Friday. "I was hallucinating. I drove around the United States for a month, following an angel that I saw on the hood of my car. . . . In my delusional thinking, I thought my family was involved in ISIS, and that millions of dollars had been taken from me to support terrorism," he said, adding, "All of it was nonsense. I was out of my mind."

He entered a program in which he was diagnosed with bipolar disorder, which causes severe and unusual shifts in mood, energy, activity levels and the ability to carry out day-to-day tasks, according to the National Institute of Mental Health. There is no cure, and sufferers need long-term treatment to control symptoms.

"It was hard to process," Stapp said. "There's a stigma associated with it. But [my wife] Jaclyn kept telling me, 'Embrace it. We love you.' It became a big sign of relief, because finally, we had an answer."